On at least one planet, Earth, some of those chemicals reacted with others, creating a complex mix of substances. New behaviors appeared, including self-replication, autocatalysis and metabolic processing. Complex colonies of reproducing units began to grow, and cooperative symbiotic behaviors developed. Single celled organisms emerged and evolved into increasingly complex forms. Eventually, mammals and primates appeared, with sophisticated intelligence. Consciousness expanded, enabling reflective capacities in language and tool making. One species, humans, was able to build civilizations and science.

On at least one planet, Earth, some of those chemicals reacted with others, creating a
complex mix of substances. New behaviors appeared, including self-replication,
autocatalysis and metabolic processing. Complex colonies of reproducing units began to
grow, and cooperative symbiotic behaviors developed. Single celled organisms emerged
and evolved into increasingly complex forms. Eventually, mammals and primates
appeared, with sophisticated intelligence. Consciousness expanded, enabling reflective
capacities in language and tool making. One species, humans, was able to build
civilizations and science.